Electric storage device

• US 8,007,936 B2
• Filed: 11/10/2008
• Issued: 08/30/2011
• Est. Priority Date: 11/12/2007
• Status: Expired due to Fees

• Current Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Original Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Inventors: Kojima, Kenji, Ando, Nobuo
• Primary Examiner(s): Maples; John S
• Application Number:
  US12/267,782
• Publication Number:
  US 20090123823A1
• Time in Patent Office: 1,023 Days
• Field of Search: 429/152, 429/241
• US Class Current: 429/152
• CPC Class Codes: H01G 11/06 with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
• CPC Class Codes: H01G 11/26 characterised by their structure, e.g. multi-layered, porosity or surface features
• CPC Class Codes: H01G 11/32 Carbon-based
• CPC Class Codes: H01G 11/46 Metal oxides
• CPC Class Codes: H01G 11/48 Conductive polymers
• CPC Class Codes: H01G 11/50 specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
• CPC Class Codes: H01G 11/86 specially adapted for electrodes carbonisation or activation of carbon for the manufacture of electrodes H01G11/34
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/5815 Sulfides
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/606 containing aromatic main chain polymers
• CPC Class Codes: H01M 4/80 Porous plates, e.g. sintered carriers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An electric storage device 10 has a first electric storage component 29 and a second electric storage component 30. The first component 29 and the second component 30 are connected in parallel. A positive-electrode mixture layer 22 contains a lithium cobaltate to increase a capacity. A positive-electrode mixture layer 27 contains an activated carbon to increase an output. A current collector 16 having through holes 16a is provided between the layers 22 and 27. A positive electrode terminal 25 is connected to a positive-electrode current collector 21 of the first component 29 through an electricity supply path 24 provided with a resistor 23. By this configuration, the electric current flowing through the first electric storage component 29 can be restricted when the device is charged or discharged with high current.

Claims

1. An electric storage device comprising:

a first electric storage component including a first positive-electrode mixture layer and a negative-electrode mixture layer opposite to the first positive-electrode mixture layer; and

a second electric storage component that is connected in parallel to the first electric storage component and includes a second positive-electrode mixture layer and a negative-electrode mixture layer opposite to the second positive-electrode mixture layer, wherein

the positive-electrode mixture layer contains a positive-electrode active material that allows ions to be reversibly doped thereinto and dedoped therefrom,

the negative-electrode mixture layer contains a negative-electrode active material that allows ions to be reversibly doped thereinto and dedoped therefrom,

the capacity of the first positive-electrode mixture layer is set higher than the capacity of the second positive-electrode mixture layer, the path resistance of the first electric storage component is set higher than the path resistance of the second electric storage component, and

a current collector provided between the first positive-electrode mixture layer and the second positive-electrode mixture layer has a through-hole formed therein.

2. An electric storage device according to claim 1, wherein

a resistor is provided in an electricity supply path of the first electric storage component so as to set the path resistance of the first electric storage component to be higher than the path resistance of the second electric storage component.

3. An electric storage device according to claim 1, wherein

a separator arranged between the first positive-electrode mixture layer and the negative-electrode mixture layer is formed to be thicker than a separator arranged between the second positive-electrode mixture layer and the negative-electrode mixture layer, in order to set the path resistance of the first electric storage component to be higher than the path resistance of the second electric storage component.

4. An electric storage device according to claim 1, wherein

the number of separators arranged between the first positive-electrode mixture layer and the negative-electrode mixture layer is set to be larger than the number of separators arranged between the second positive-electrode mixture layer and the negative-electrode mixture layer, whereby the path resistance of the first electric storage component is set higher than the path resistance of the second electric storage component.

5. An electric storage device according to claim 1, wherein

the electricity supply path of the second electric storage component is set to be smaller than the electricity supply path of the first electric storage device so as to set the path resistance of the first electric storage component to be higher than the path resistance of the second electric storage component.

6. An electric storage device according to claim 1, wherein

a gap is formed between the first positive-electrode mixture layer and the negative-electrode mixture layer in the first electric storage component so as to set the path resistance of the first electric storage component to be higher than the path resistance of the second electric storage component.

7. An electric storage device according to claim 1, wherein

when the device includes plural first positive-electrode mixture layers and at least one or more second positive-electrode mixture layer, the outermost positive-electrode mixture layer is defined as the first positive-electrode mixture layer.

8. An electric storage device according to claim 1, wherein

a lithium ion source is provided to be opposite to the negative electrode including the first negative-electrode mixture layer, wherein lithium is doped into the negative-electrode mixture layer from the lithium ion source.

9. An electric storage device according to claim 1, wherein

the device structure is a laminate type or a wound type.

10. An electric storage device according to claim 1, wherein

different types of positive-electrode active materials are used for the first positive-electrode mixture layer and the second positive-electrode mixture layer, wherein the capacity of the first positive-electrode mixture layer is set higher than the capacity of the second positive-electrode mixture layer.

11. An electric storage device according to claim 1, wherein

the same type of positive-electrode active material is used for the first positive-electrode mixture layer and the second positive-electrode mixture layer, and the first positive-electrode mixture layer is coated to be thicker than the second positive-electrode mixture layer so as to set the capacity of the first positive-electrode mixture layer to be higher than the capacity of the second positive-electrode mixture layer.

12. An electric storage device according to claim 10, wherein

the positive-electrode active material contained in the first positive-electrode mixture layer and the second positive-electrode mixture layer is selected from an activated carbon, conductive polymer, polyacene-based material, lithium-containing metal oxide, transition metal oxide, transition metal sulfide, iron phosphate, ruthenium oxide, inorganic sulfur, organic molecule containing sulfur atom involved in a redox, and a high-molecule material that has, as a monomer, an organic molecule containing sulfur atom involved in a redox.

13. An electric storage device according to claim 10, wherein

the positive-electrode active material contained in the first positive-electrode mixture layer is LiCoO₂, and the positive-electrode active material contained in the second positive-electrode mixture layer is an activated carbon.

14. An electric storage device according to claim 13, wherein the negative-electrode active material contained in the negative-electrode mixture layer is a polyacene-based organic semiconductor, wherein the ratio of (the number of hydrogen atoms)/(the number of carbon atoms) is 0.05 or more and 0.50 or less.